import { IElement, ICoding, IReference } from 'fhirtypes/dist/r4';
import { IQuestionnaireAnswerOption, IOperationOutcome } from 'fhirtypes/dist/r4';
import { BackboneElement, IValidatable, ISerializable } from '../base';
/**
  * @version R4 (v4.0.1)
  * @summary FHIR® Specification by HL7®
  * @description Class for QuestionnaireAnswerOption BackboneElement
  undefined
  * @property {number} valueInteger
  * @property {IElement} _valueInteger
  * @property {string} valueDate
  * @property {IElement} _valueDate
  * @property {string} valueTime
  * @property {IElement} _valueTime
  * @property {string} valueString
  * @property {IElement} _valueString
  * @property {ICoding} valueCoding
  * @property {IReference} valueReference
  * @property {boolean} initialSelected
  * @property {IElement} _initialSelected
  * @author Roberto Araneda Espinoza
  */
export declare class QuestionnaireAnswerOption extends BackboneElement implements IQuestionnaireAnswerOption, IValidatable, ISerializable {
    /**
     * @description A potential answer that's allowed as the answer to this question.
     */
    valueInteger?: number;
    /**
     * @description Extensions for valueInteger
     */
    _valueInteger?: IElement;
    /**
     * @description A potential answer that's allowed as the answer to this question.
     */
    valueDate?: string;
    /**
     * @description Extensions for valueDate
     */
    _valueDate?: IElement;
    /**
     * @description A potential answer that's allowed as the answer to this question.
     */
    valueTime?: string;
    /**
     * @description Extensions for valueTime
     */
    _valueTime?: IElement;
    /**
     * @description A potential answer that's allowed as the answer to this question.
     */
    valueString?: string;
    /**
     * @description Extensions for valueString
     */
    _valueString?: IElement;
    /**
     * @description A potential answer that's allowed as the answer to this question.
     */
    valueCoding?: ICoding;
    /**
     * @description A potential answer that's allowed as the answer to this question.
     */
    valueReference?: IReference;
    /**
     * @description Indicates whether the answer value is selected when the list of possible answers is initially shown.
     */
    initialSelected?: boolean;
    /**
     * @description Extensions for initialSelected
     */
    _initialSelected?: IElement;
    /**
     * @description Returns a JSON representation of the model
     * @returns {Record<string, any>}
     */
    toJson(): Record<string, any>;
    /**
     * @description Returns a string representation of the model
     * @returns {string}
     */
    toString(): string;
    /**
     * @description Returns a pretty string representation of the model
     * @returns {string}
     */
    toPrettyString(): string;
    /**
     * @description Returns a serialized string representation of the model
     * @returns {string}
     */
    serialize(): string;
    /**
     * @description Validates the model
     * @returns {isValid: boolean, operationOutcome: IOperationOutcome}
     */
    validate(): {
        isValid: boolean;
        operationOutcome: IOperationOutcome;
    };
    constructor(args?: IQuestionnaireAnswerOption);
}